Saw filing machine



Jam 12, 1943. c. H. CARLSON SAW FILING MACHINE Filed Dec. 9, 1940 6 Sheets-Sheet l Jan. 12, 1943. Q H, CARLSON 2,308,053

sAw FILING MACHINE Filed Dec. 9, 1940 GSheets-Sheet 2 Kfer-@Py Jan. 12, 1943. c. H. CARLSON SAW FILING MACHINE Filed Dec. 9, 1940 6 Sheets-Sheet 3 Jan. 12, 1943. c. H. CARLSON 2,308,053

sAw FILING MACHINE 'Filed Dec. 9, 1940 e sheets-sheet 4 Fig. a.

Jan. '12, 1943,.4 c. H. CARLSON 2,308,053

uw FILING MACHINE Filed Deo. 9, 1940 a .Sheets-sheet 5 C. H. CARLSON sAw FILING MACHINEl `yFiled Deo. 9, 1.9M'.`

Jan. 12, 1943.

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humana. 12, 194s UNITED STATES PATENT OFFICE '2.80am y A sswrxmramcimrs Charleslcarlsemmnneapoliamnn.

Application December 9. 1940, Berlalhn $69,209 whim. (ciu-'11i This invention relates to a saw ming machine. The machine of the invention is designed to ille various kinds of saws including hand saws, circular saws and band saws of various types.

It is an obiect oi this invention to provide a simple and enlcient machine which will automatically ille or sharpen the saw and put it in the best possible condition for use.

' It is a further object o! the invention to provide a machine for illing or sharpening saws which will so prepare the teeth ot the saw for use that the small burr usually formed on the saw will be most eilectively disposed.

It is still another object of the invention to provide a machine for tiling or sharpening saws which will file or sharpen a band saw and give a deeper cut on certain teeth at desired intervals. l

It is also an object oi' thpliinvention to provide a machine for tiling or sharpening saws in which the saw is moved successively small distances equal to the space between the teeth by engaging the saw at places other than at the teeth.

It is still another object or the invention to provide a machine for iiling and sharpening saws comprising a novel saw carrier.

It is still further an object of the invention to provide a machine for nling -or sharpening saws comprising la novel combination oi drive and driving elements.

These and other objects and advantages of Fig. 10 is avertical sectiontakenonline iI-II o! Fig. 11 as indicated by the arrows;

Fig. 11 is a vertical section taken substantially on line ii-li of Fig. as indicated by the arrows:

rig. 12 isa top plan view of a cam mechanism member;

Fig. 13 is a view in front elevation ot the member shown in Fig. 12, as seen from line Fig. 14 is a vertical section taken on line ll-II of Fig. 11 as indicated by the arrows:

Fig. l5 is a view similar to Fig. 14 showing the parts in different positions;

Fig. 16 is for the most part a view in iront elevation of a modification. or attachment for the machine, some parts being broken away and y othersshown in vertical section on line il-It the invention will be iully set forth in the following description made in connection with the accompanying drawings in which like reference characters refer to similar parts throughout the several views and in which:

Fig. 1 is a view in side elevation of the machine;

Fig. 2 is a top plan view; g

Fig. 3 is a partial view in side elevation as seen from the side opposite that shown in Fig. 1, some parts being shown in vertical section;

Fig. 4 is a partial view in front elevation;

Fig. 5 is a partial view in front elevation showing a saw carrying rack;

Fig. 6 is a vertical section taken on line 0-0 oi Fig. 5 as indicated by the arrows;

Fig. 'I is a vertical section taken on line 1--1 of Fig. 9 as indicated by the arrows;

Fig. 8 is a partial view in front elevation, some piarts being shown in different positions in dotted l nes;

Fig. 9 is a partial view in side elevation, some parts being removed;

of Fig. 17;

Fig. 17 is a view in side elevation as seen from the right ot Fig. 16:

Fig. 18 is a horizontal section taken on line i8-il of Fig. 16 as indicated by the arrows;

Fig. 19 is a vertical section taken on line ia-il of Fig. 20 as indicated by the arrows: and

Fig. 20 is a vertical section taken on line ll-Il ot Fig. 18 as indicated by the arrows.

Referring to the drawings a machine is shown 4having an upstanding trame 2S, the same having a base flange 25a on which it rests. While frame 2l could be variousLv formed, in the embodiment of the invention illustrated it is shown as being oi' the box type substantially rectangular in horizontal cross section and having at its top a horizontal flange 25h. Flange 25h has disposed thereon a top plate or flange 28 lwhich will be secured to nange 25h in any suitable manner as by headed bolts I1. The shape in plan of portions 2lb and 2i is clearly shown in Fig. 2. A bracket 2l is secured to plate Il by the headed bolts 2l, the same having abottom nange through which extend supporting and adjusting screws or bolts Il. Bracket 2l has a iiange at its top to which is secured a motor 3| shown as of the electrical type. Motor 3| has its amature or driving shaft connected by suitable transmission mechanism 32 to a shaft "33. While the transmission mechanism i2 could be varied as desired, in the embodiment of the invention illustrated it is shown as a direct coupling. Shaft "It has secured thereto a worm gear 35, which in turn meshes with a worm wheel gear 3| adapted to rotate on the shalt $1. Shaft l1 is journaled in an upstanding bracket 3l secured to plate 2l by bolts 39. A nut 31h is threaded on shaft I1 adjacent bracket 38 at one side of worm wheel gear 36 and at the other side i of said gear shaft 31 is provided with a spline 31a in which is disposed a key 40a secured to a clutch plate 40. A clutch collar or bracket 4| is threaded shgfgl adjacent clutch plate 4 and has clutch fork or yoke 45. Member 45 has pins 451) projecting into the yoke portion of a. clutch lever 46 extending to the iront side of shaft 31 and pivoted on a stud 41 secured in plate 26. Shaft 31 and parts 40 to 46 are enclosed in a frustaconical shell or casing 49. Casing 49 has oppositely disposed lugs 49a extending into recesses in a bracket 58 having an upper portion-of frustoconical form about shaft 31 and extending to plate 26 to which it is secured. Shaft 31 is reduced at its end and has secured thereto a hand wheel held in place by a nut 52 threaded on the end of shaft 31. At its inner end shaft 31 is reduced and has secured thereon a cam and pitman disk 55, the same being held in place by a nut 56 threaded on the end of shaft 31. Disk 55 has an arm 55a at its inner side threaded to receive a headed stud 51 on which is journaled the hub at one end of a pitman link 58. The other end of'link 58 is pivotally connected by a headed stud 59 to a reciprocating file-carrying bar 68. Disk 55 has a peripheral cam surface which acts against a cam bar 6| pivotally connected at one end by pivot 62 to a lug 63a projecting from :a plate 63 secured by headed screws 64 to a member 65 disposed at one side of an oscillating lever 66. Lever 66 is pivoted at its rear end to a pivot shaft or pin 66a carried in lugs at the upper end of an upstanding bracket 69 secured to plate 26 by bolts 69a. Bracket 69 also has a flange at its bottom through which extend supporting and adjusting screws 69h. As shown in Fig. 2 lever arm 66 has spaced lugs through which pin 66a extends and these are disposed at theouter sides of the spaced lugs at the top of bracket 69. A rod 53 is secured in member 26 and extends vertically through arm 66. A spring 54 is disposed between the top of arm 66 and a nut 53a on the top of rod 61.

A cam operating member or star wheel 1| is provided, the same having cylindrical journal portions 1|a at its ends which are .iournaled respectively in bores in plates 63 and E3 as shown in Fig. 11. Member 1| has the star wheel portion 1lb with lugs projecting in circumferentially spaced relation therefrom,'the same being shown as eight in num-ber. Member 1| also has a cam portion 1| c, which as shown in Figs. 13, 14 and 15 is provided with flattened opposite sides, the same being otherwise cylindrical. As shownln Fig. ll portion 1 |c overlies the bar 6|. A's shown in Figs. 14 and l5 when the flat sides of portion 1|c are horizontal bar 6| may occupy a higher position than when said flattened portions are vertical as shown in Fig.` l5. In vthe latter position the cylindrical part of portion 1|c engages bar 8|. Disk 55 has thereon a projecting tooth 55h adapted to engage the teeth oi' star wheel portion 1lb. Plate 63 is provided with a flange at the side opposite lug 63a through which extends a headed screw 13 adapted to engage the top of bar 6|.

- Screw 13A can be held in adjusted position by a smaller screw 14 threaded' into said flange and engaging screw 13.

The member 60 is shown as provided with spaced vertical slots extending therethrough, through which extend pins 16 secured to blocks 16a, said pins having their ends threaded to receive knurled adjusting nuts 11. Members 18 extend through the blocks 16a and are constructed and arranged to hold the ends of a iile 80 which is used to file or sharpen the saw. Members 18 are held in desired adjusted position by set screws 19. Pins 16 can be held rmly in position by means of set screws 8| extending through the side of member 60. Lever` arm 66 has downwardly extending side portions forming a channel at its underside and a crosshead 61 reciprocates substantially centrally of said channel, the same having inclined sides engaged respectively by gibs 68. Gibs 68 are held in place by longitudinally spaced and headed screws 10 equipped with lock nuts 10a. Crosshead 61 has a downwardly extending portion in which le-carrying member 60 is received and to which it is secured by the headed screws 68h. Member 66 has a plate 82 secured to its front end by spaced bolts 83, which plate has'a forward downwardly ofiset portion having a flat top surface engaged 4by certain members to be later described.

The plate 26 at its forward end has secured thereto a clamping member 85 secured by a bolt 86 beneath which is held a bracket 81. As shown in Fig. 2 bracket 81 has an arcuate ilange disposed beneath bracket 85 and is graduated for adjustment. A pointer 85a is secured to member 26 adjacent member 81. Bracket 81 has secured thereto by bolts 88 having countersunk heads, a vertically extending bracket 89. Bracket 89 has upper spaced portions 89a bored to receive and hold headed stationary studs 90. Journaled on each stud 90 is a lever 9|. Levers 9| each have pivoted to its upper end a lever 92. Levers 92 have adjacent ends resting on the top of plate 82 and extending away from said plate in symmetrical relation to the center line of -bracket 89. Each lever 92 has threaded therein a thumb screw 93 which engages with a shoulder portion 9|a formed on each lever 9|. Levers 92 also have secured to their remote sides tensile coiled springs 94 which extend downwardly and are secured at their lower ends to lugs 9|b respectively which are disposed at the outer sides of levers 9|. Springs 94 thus urge the outer ends of levers 92 downwardly and hold the ends of screws 93 against shoulders 9|a. Pivotally secured to the lower ends of levers 9| by pivots 96 are pawls 91. Pawls 91 are provided with top surfaces and each has a downwardly and outwardly sloping riding surface 91a. While this surface might be variously formed or disposed, in the embodiment of the invention illustrated it extends at an angle of substantially 45 degrees to the top surfaces of member 91. Each pawl 91 comprises a portion 99 pivotally secured to its inner end by a pivot 98. Each portion 99 can be brought into rectilinear alinement with its main portion 91 at which time a small screw |10 engages a recess 99a in portion 99 or said portion 99 can be swung to inoperative position substantially at right angles to its main portion 91 as shown at the right hand side of Fig. '1 at which time recess 99a moves out of engagement with screw |08. It will be noted that the lower end or each lever 9| is bifurcated and embraces its pawl 91. Each arm 91 has a lug 91b at its top apertured to have secured thereto the lower end of a tensile coiled spring |0|, the upper end of which is secured to lug 9|b. The`outer end of Secured each pawl I1 is thus urged upwardly. in stationary position on the outer end of each stud 50 at the end of the pivot hub' of its lever 8| is an arm |03, the same being held in place by a nut |04 threaded on the forward end of stud 00. Each arm |03 extends downwardly and is provided with a longitudinally extending slot |0311. A stud |05 formed at its inner end as a cylindrical pin |05a is secured in slot |03a held in place by a nut and washer |08 and |01 respectively. Pin |05a overlies the top surface of its pawl l1 and permits movement of said pawl to engage the saw.

Bracket 89 has secured adjacent its top a right angled bracket or plate H0, the same being shown as held by countersunk screws The top portion of plate extends over the upper portion of bracket 59 at the central recess therein and forms the inner jaw of a vise. are secured to the front of bracket 50 adjacent its upper portion by the countersunk screws ||5, said plates being secured to lugs projecting a short distance forwardly of bracket 80 so that slots IIB and ||1 are formed by plates ||4. Cooperating with the plate lil is a swinging member ||8 having a lug at its bottom pivoted between spaced lugs on bracket 89 by the headed and nutted bolt H9. Member is curved inwardly to have a horizontal top portion which" cooperates with plate ||0 and forms the outer jaw of said vise. Member ||5 has a rather long central and vertical slot lia therethrough. Bracket 89 also has a central vertical slot therethrough and a cup-shaped member is secured against the outer side of said bracket, the same being held in place by a screw |2| which is bored and threaded at its inner end to receive aholding screw |22 passing through the slot in bracket 89 and having a head at the inner side of said bracket beneath which is disposed a washer |23 .engaging said bracket. An arbor member |24 of substantially conical form'is journaled on screw |2| and a nut |25 is threaded on said screw between said arbor and member H5. A nut |26 having a star wheel handle at its outer side is threaded on screw |2I at the outer side of member ill, screw |2| being provided with a pin handle |2|a extending through its outer end. In Fig. 3 a circular saw |28 is shown as having a central opening into which arbor |24 extends, said saw being held against member |20 so that said saw is revolubly supported upor arbor |24.

In Figs. 5 and 6 a saw carrier is shown comprising an elongated bar |30 rectangular in cross section and of a size to be received in slots ||5 and behind plates ||4. Bar |30 has secured thereto as by welding depending bars |30a. Bars |30a haveslidable thereon apertured members |3| to which are secured the vertically extending lugs |3|a having lower ends bored and threaded to receive thumb screws |32. A hand saw |34 can be placed on members |3| and in front of bars |30a, the same being in the rear of the upper ends of lugs |3| which extend above members |3|. The screws |32 can be rotated to engage the barsV |30a respectively, members |3| having slight movement on bars |3011. The upper ends of lugs |3|a can thus be adjusted to have the desired pressure on the lower edge of saw blade |34. 'I'he jaws of the vise formed by members ||0 and H8 will be brought against opposite sides of the saw blade |34 at its upper end by adjustment of nut |25 so that there will be the desired holding and friction on saw blade |34.

Plates I |4 In operation motor 3| will be operated and this will rotate shaft 33 and worm gear 35 so that worm wheel gear 35.,.wil1 be rotated. A le such as shown as 80 will be placed and held between members 18 so that the same will be reciprocated bythe member 50. The saw being in place the machine can now be operated by engagement of the clutch disk 40. This can be effected by movement of clutch handle 46. This will move member 4| outwardly on .shaft 31 so that the outer ends of arms 43 will 'be moved away from each other which will cause said arms to swing and cause the inner ends of said arms to move disk against the outer face of worm wheel gear 36. Disk 40 is then rotated by gear 35 and this drives shaft 31 through the key 40a. Rotation of shaft 31 rotates the disk 55. Rotation of disk reciprocates crosshead 51 through movement of link 58. Reciprocation of crosshead Y51 reciprocates member 6 0 and thus the file` 80. At each revolution of shaft 31 the cam periphery of disk 55 .raises bar 5| and thus the lever arm 56 and the forward portion of arm 65 is thus raised some distance and member 60 and file 80 are raised during reciprocation in one direction. Spring 54 urges and moves arm 55 downwardly. This is usually a reciprocation when' the le is moving outwardly or forwardly. 'I'he pawl 01 which is being used, such as the one at the left as shown in Fig. 8, will engage the successive teeth of the saw and move the saw a distance of one tooth at each oscillation. As the outer end of lever arm 55 is raised the plate I2 oscillates the lever 92. This through the screw 93 oscillates arm 9| and this gives the pawl 01 a combined reciprocating and swinging movement. When the inclined portion 31a of pawl 01 moves past the pin |05a this permits the inner end of the pawl to drop or move downwardly and the pointed end of pawl portion 99 engages a tooth of the saw and the saw is moved during the remainder of the movement of pawl 99 and arm 9|. This amount of movement is determined by trial and observation and the proper adjustment can be made by properly locating stud |05 and turning thumb screw 03. The machine thus operates to move ille 00 outwardly, then to lower said file and draw the same inwardly against the edges of the teeth. The le is then raised dueto operation of cam 55 and the lever arm 66 acts to feed the saw another notch or distance of one tooth as file moves outwardly. The operation is then repeated. In filing or sharpening band saws such as illustrated in Fig. 8 it .is desired to have the space between the teeth at certain intervals cut somewhat deeper. In the rotation of disk 55 tooth 55h will engage star wheel 1| b and change the position of the cam portion 1|c. When this cam portion is turned to the position shown in Fig. 14 with its fiat sides horizontal bar 8| moves to a higher position and the lever arm 65 can thus move downwardly a greater distance and move the le I0 downwardly a greater distance. When the cam portion 1|c is turned to the position shown in Fig. l5 bar 5| is lowered and lever 55 will be prevented from coming down so far and file Il will not cut as deeply into the saw. With the 4construction shown having eight teeth on star wheel 1lb every fourth space is cut somewhat deeper. The number of teeth on the star wheel could of course be varied to give the deep space at the desired interval. If the operation of cam portion 1|c is not desired, as when operating on a hand saw, bar 5| can be maintained in thev position shown in Fig. 15 by adjustment ci' screws 18 and 14. 'I'his renders cam portion 1|c inoperative. 'I'he operation is the same whether the saw is moved horizontally in the saw carrier shown in Figs. and 6 or whether it is a circular saw mounted as shown in Fig. 3. The circular saw merely rotates through the distance of the tooth space. K

The machine can be turned over or operated by hand by turning hand wheel 5|. This rotates shaft 31 and disk 55. This will be desirable at times especially when adjusting the parts for proper feeding of the saw.

Referring to Figs. 16 to 20 a device is shown comprising a bracket |50. This will be mounted on member 89 already described. Said bracket will be secured by a headed bolt |5| extending through slot 89a. A washer |52 underlies the head of bolt |5| and said bolt is threaded into a block |53 welded or otherwise secured to the rear of bracket |50. Bracket |50 which is generally in the form of a rectangular plate has secured thereto adjacent ih lower edge a laterally extending arm |58a. `Arm |50a has a forwardly projecting lug |50?) which is bored and threaded to receive the lower end of a screw |54 having an enlarged cylindrical upper end having extending therethrough and secured therein a handle-forming pin |54a. The said enlarged upper end has a lower frusto-conical surface |54b which rests upon the upper side of a lever arm 55. The outer end of lever arm |55 is reduced in thickness and curved at its upper and lower side, the same having extending vertically therethrough a slot |55a through which screw |54 passes. A compression coiled spring |56 surrounds screw |54 bearing at its lower end against the upper surface of lug |50b and bearing at its upper end against a washer |51 engaging the lower convex side of the outer end of lever |55. Lever |55 is pivoted about the stud |58 secured in bracket arm |50a and equipped at the outer side of lever |55 with a nut |59, said stud having an enlarged portion between arm |50a and lever |55. Lever |55 is provided with an open-ended longitudinally extending slot |55b at its other end through which passes a stud I 60 having a reduced portion disposed in slot |55b. Stud |60 is secured to a carrier bracket ||62 havingV ilanges atA its sides embracing the bracket |50 and slidable thereon. It will thus be seen that by turning screw |54 lever |55 will raise or lower carrier bracket. |62. Bracket |62 carries at its upper end a plate |63. Plate |63 has a pair of spaced arcuate slots |63a therein through each of which passes a stud |64, the same being equipped with a nut |65 at the outer side of plate |63 be-l neath which is a washer |66. Plate |63 can thus be adjusted to position with its top horizontal or it may be positioned with said top at an angle to the horizontal. Plate |63 is provided with a slot in its upper surface in which a saw blade |68 such as a band saw blade is adapted to snugly fit and be slidable therein. Plate |63 also has a vertical slot |63b adjacent its side as shown and said plate is equipped on its rear side with a vertical groove |69a rectangular in horizontal cross section in which fits a tongue or rib |69b forming part of a bar |69 which projects at the right of bracket |63 as shown. A headed screw |10 having a washer |1| under the head thereof' extends through slot |631) and into bar |69 so that said bar may be adjusted vertically and held in different positions. Slidable on bar |69 is a bracket |13 having strips |13a at its ends extending about and embracing bar |69 so as to fit snugly thereon 'and be slidable thereon.V Bracket |18 has an u wardly extending portion provided with a T-slot |13b and adapted to receive the lower partly cylindrical end of a propelling dog |14. Bracket |13 also has. a forwardly projectingportion |13c in which is secured a stud |15 having one end riveted in portion |13c. Stud |15 projects at one side of portion |13 and a dog |16 is provided with a slot |160 through which stud |15 passes. A compression coiled Ispring |11 shown as of irustoconical form engages dog |18 at its larger end and at its smaller end engages a washer |18 which is held on studv |15 by a nut |18 threaded on said stud. Dog |16 projects at one side of portion |13c and has a handle portion |16b extending at an angle to the main body ci said dog. Portion |13c has at its end a laterally projecting lug |13d which is threaded to receive a headed screw provided with a lock nut |8| which engages the outer side of lug |1311. The end of screw |80 overlies and is adapted to engage the adjacent edge of dog |16 as clearly shown in Fig. 20. The member |14 already referred to is provided with a central longitudinal slot |14a thru which extends a screw |82 securing member |14 to its carrier |84 which is inthe form of a lever having a hub |84a oscillatably mounted on a stud |95 carried in one bracket portion 89a already described. Stud |85 is provided with suitable nuts lss. Lever arm m 'like the lever arms 9| is pivotally connected to a member |86 similar in all respects to members 92 already described and having anxend adapted to overlie and be engaged by the top surface of member 82. A tensile coiled spring |89 has one end connected to the outer end of lever |88 and its other end connected to a lug on lever |64 disposed below pivot stud |85. A thumb screw |90 is threaded into lever |88 and at its lower end engages the shouldered surface formed on lever |84.

The attachment shown in Figs. 16 to 20 is used for the purpose of progressing the saw blade without engaging the teeth of said saw. This is some-v times desirable as the very small burr formed on the teeth can be left'undisturbed. The saw |68 will be placed in the slot in the top of bracket |63 as shown and the vise jaws on members ||8 and |0 will be suitably engaged with opposite sides of said blades. The operating file 80 will be used as previously described. When member 82 is raised and lowered as already described lever |88 will be oscillated as will also lever arm |84. 'Ihis will oscillate member |14. As member 82 is raised and member |14 moves to the left as shown in Fig. 16, bracket |13 will be moved to the left on its guide bar |69. This moves portion |13c and dog |16. Dog |16 is adjusted so that as said bracket |13 moves the inner edge of said dog will engage and bind against saw blade |68 as shown in Fig. 20. Said dog will thus grip saw |68 and move it to the left. This movement can be adjusted in extent by adjustment of screw |90. Propelling member |14 can be suitably adjusted in relation to bracket |13 by screw |82. When member 82 descends spring- |89 will swing lever |84 and propelling member |14 to the right. This will slide bracket |13 to the right and when this occurs dog |16 will swing about its edge adjacent screw |80 or its outermost edge as indicated in dotted lines in Fig. 19 and will not bind against the saw blade |68 but will merely slide along the saw. Dog |16 has rather free movement on stud |15 and its swinging movement is readily permitted by spring |11. The saw blade |68 is thus reciprocated the desired amount with each oscillation of levers |84 and |88. The bracket |63 can laccepts posite edge of the saw blade rather than at right angles thereto. 'Ihis effect can be secured by adjustment of bracket |63. It will thus be seen that I have provided a means for progressively moving the saw to be sharpened without'propelling the same by engagement of the teeth of the saw. This means has advantages in sharpening certain kinds of saws. Obviously the operation of the cam i and member 1| 'will be the same using the saw propelling means shown in Figs. 16 to 20 as in the other mechanisms shown and described.

From the above description it will be seen that I have provided a greatly improved structure of saw filing machine. The same is compact, comprises a minimum of parts andai'fords all the adjustments necessary for properly nling and sharpening the saw. The feeding pawls, when position adjacent said pawl and a member pro- Jecting from said bracket overlying said pawl, the body of said pawl having on its top a surrace cooperating with said member in the movement of said pawl for moving the latter toward said saw.

3. A saw filing machine having in combination, means for holding a saw for progressive movement. a pawl for engaging the teeth of said saw for progressively moving the same, a member carrying said pawl, a pivot about which said member is oscillated, an adjustable bracket adthese are used, do not engage the last filed tooth i of the saw if this is not desired. It will also be seen that I have provided an improved structure for controlling the movement of the feeding pawl toward and from lthe saw. Instead of having a cam arm which determines the'movement of the pawl the movement is obtained by the swinging movement ofA the pawl itself. The pin Illia can be adjusted in its bracket |03 and said bracket may also be adjusted to give the desired movement to the pawl. It will also be noted that the pin Illia is at the rear o! the pivot whichA connects the pawl to its swinging member. The combination for reciprocating the file and arm 86 is also novel and eiiicient and the provision of the clutch which may disconnect the driving mechanism so that the machine can be turned over by hand wheel 5l is also very convenient. The machine as described automatically provides for making a deeper cut on a tooth at desired intervals. The machine has been amply demonstrated in actual practice. found to be very successful and eilicient and is being commercially made.

It will, of course, be understood that various changes may be made in the form, details, arrangement and proportions of the parts, 'without departing from the scope of applicants invention, which generally stated, consists in a device capable o! carrying out the objects above set forth, in the parts and combinations of parts disclosed and defined in the appended claims.

What is claimed is:

1. A saw iiling machine having in combination, means for holding a saw for progressive movement, a pawl for engaging the teeth of sld saw ior progressively moving the same, a swinging member carrying said pawl for oscillating the same, a lever for'variably actuating said swinging member, an adjustable bracket adjacent said p pawl and a member adjustably mounted in stationary position on said bracket, said pawl having a surface on the body thereof cooperating with said member in the movement of said pawl to move the latter toward said saw.

2. A saw nling machine having in combination, means for holding a saw for progressive movement, a pawl for engaging the teeth of said saw for progressively moving the same, a swinging member carrying said pawl for oscillating the same. a lever to which said member is pivoted having means for actuating said member. en adjustable pivoted bracket held in stationary jacent saidpawl swingable about said pivot. to be held in different stationary positions relative thereto, a member on said bracket, the body of said pawl having a top surface at the side of Y said pivot remote from its operative end c0- operating with said surface in the movement of said pawl for raising said pawl and permitting movement' of the same toward said saw said member being movable to different positions longitudinally of said bracket.

4. A saw iiling machine having in combination, means for holding a saw for progressive movement, a vertically movable member. a lever having one end engaged by said member and oscillated thereby, a swinging member pivotaily connected at its upper end to an intermediate point on said lever. saidswinging member having an upper surface thereon. an adjustable member carried by said lever at the sideof its pivot remote from said end engaging said surface for oscillating said swinging member, a pawl pivotaily connected to the lower end of said swinging member. an adjustable bracket adjacent-said pawl, a member adjustably carried in said bracket adapted to engage the top of said pawl, the body of said pawl having an inclined surface on its top acted upon by said last mentioned member and resilient means holding said.pawl and last mentioned member in ennment.

5. A saw filing machine having in combination, means for holding a saw for progressive movement, a pawl for engaging the teeth of said saw for progressively moving the same, a swinging member to which said pawl is pivotaily con y Aa surface above said pivotal "connection, a lever pivoted intermediate its ends to the upper end of said swinging member, means engaging one end of said lever for oscillating the same, a member adjustably carried by said lever adjacent its other end engaging said surface to move 'said swinging member, a spring for holding said last mentioned member in engagement with said surface, a pawl pivotaily carried by said swinging member below said pivotal connection and means for moving said pawl to cause said pawl to engage said saw.

'1. A- saw filing machine having in combination, a frame, means for holding a saw for progressive movement, a swinging member pivoted intermediate its ends -to said frame, a lever pivoted intermediate its ends to said swinging meming member below its pivotal connection, a member above the pivotal point of the latter, means ber engaging said pawl foroscillating` said pawl engaging one end of said lever for oscillating to cause said pawl to engage said saw and rethe same, means carried by said lever engaging silient means holding said pawl and last. mensaid swinging member to oscillate the latter and 5 tioned member in engagement.

to.v vary the relative positions of said lever and swinging member, a pawl carried by said swing- CHARLES H. CARISON. 

